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Subject[PATCH] free initrds boot option
Date
Add free_initrd= option to control freeing of initrd memory after
extraction. By default, free memory as previously.

Signed-off-by: Michael Neuling <mikey@neuling.org>
---
Useful for kexec when you want to reuse the same initrd. Testing on
POWERPC with CPIOs

init/initramfs.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)

Index: linux-2.6-ozlabs/init/initramfs.c
===================================================================
--- linux-2.6-ozlabs.orig/init/initramfs.c
+++ linux-2.6-ozlabs/init/initramfs.c
@@ -487,6 +487,17 @@ static char * __init unpack_to_rootfs(ch
return message;
}

+static int do_free_initrd = 1;
+
+int __init free_initrd_param(char *p)
+{
+ if (p && strncmp(p, "0", 1) == 0)
+ do_free_initrd = 0;
+
+ return 0;
+}
+early_param("free_initrd", free_initrd_param);
+
extern char __initramfs_start[], __initramfs_end[];
#ifdef CONFIG_BLK_DEV_INITRD
#include <linux/initrd.h>
@@ -494,10 +505,13 @@ extern char __initramfs_start[], __initr

static void __init free_initrd(void)
{
-#ifdef CONFIG_KEXEC
unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
unsigned long crashk_end = (unsigned long)__va(crashk_res.end);

+ if (!do_free_initrd)
+ goto skip;
+
+#ifdef CONFIG_KEXEC
/*
* If the initrd region is overlapped with crashkernel reserved region,
* free only memory that is not part of crashkernel region.
@@ -515,7 +529,7 @@ static void __init free_initrd(void)
} else
#endif
free_initrd_mem(initrd_start, initrd_end);
-
+skip:
initrd_start = 0;
initrd_end = 0;
}
-
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